<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="css/float_grid.css">
  <style>
    .container .row div span {
      background-color: red;
      display: block;
      margin-bottom: 30px;
      height: 100px;
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="row">
      <div class="col-xs-12 col-sm-3 col-md-8 col-lg-4"><span>1</span></div>
      <div class="col-xs-12 col-sm-9 col-md-4 col-lg-4"><span>2</span></div>
      <div class="col-xs-12 col-sm-3 col-md-8 col-lg-4"><span>3</span></div>
      <div class="col-xs-12 col-sm-9 col-md-4 col-lg-4"><span>4</span></div>
      <div class="col-xs-12 col-sm-3 col-md-8 col-lg-4"><span>5</span></div>
      <div class="col-xs-12 col-sm-9 col-md-4 col-lg-4"><span>6</span></div>
      <div class="col-xs-12 col-sm-3 col-md-8 col-lg-4"><span>7</span></div>
      <div class="col-xs-12 col-sm-9 col-md-4 col-lg-4"><span>8</span></div>
      <div class="col-xs-12 col-sm-3 col-md-8 col-lg-4"><span>9</span></div>
      <div class="col-xs-12 col-sm-9 col-md-4 col-lg-4"><span>10</span></div>
    </div>
  </div>
</body>
</html>